Circle Definition: Lesson for Kids

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  • 0:04 Introducing the Circle
  • 0:28 What Is a Circle?
  • 0:45 Where Can You Find Circles?
  • 1:50 Activity: Scavenger Hunt
  • 2:52 Lesson Summary
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Lesson Transcript
Instructor: Shelly Merrell

Shelly has a Master's of Education. Most recent professional experience is an educational diagnostician. Prior, she taught for 8 years.

In today's lesson, we'll talk about circles. Read on to learn what a circle is, what a circle looks like, and why circles are important. Then, test your knowledge with a fun activity and a short quiz.

Introducing the Circle

Do you remember the song 'If You're Happy and You Know It?' Start singing that song! Are you clapping, stomping and jumping? Now let's use the tune and change the words for 'The Circle Song:'

A circle is a shape that is round.

A circle is a shape that is round.

A circle is a shape that is round,

And round and round.

A circle is a shape that is round.

Circles are round shapes.
black circle

What Is a Circle?

Now that you have circles on your mind, let's learn more about this interesting shape. A circle is a shape that is made up of a curved line. It's round, and all points on the curved line are an equal distance from the center point. This shape is two-dimensional, which means it's flat.

The black dot represents the center of the circle.

Where Can You Find Circles?

Circles are very important parts of geometry, the study of points, lines and shapes; but they're important outside of geometry as well. In fact, you can find circles in everyday life--they're just about everywhere. Do you have a cup on your desk? The shape of the rim is probably a circle. Is there a round button on your shirt? That's probably a circle, too! And so is the letter 'o' you find in so many words.

You may have noticed that the circles listed are all man-made, but circles are also very common in nature. The rings around Saturn, the pupils of your eyes and the center of a flower are all circles that are made by Mother Nature.

One interesting thing about circles is that there are no perfect circles. A perfect circle is one where the curved line is exactly, precisely the same distance from the center point. Look at the button on your shirt. It may seem to be perfectly circular, but if you look very closely, you'll notice some small imperfections. The same goes for all other circles you encounter, even if you need to look under a microscope to notice those imperfections.

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